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H. A. PERKINS. CUTTER HEAD GRINDER.

APPLICATION FILED APR. 20. I916.

Patented Aug. 1, 1916. v

2 SHEETS-SHEET I.

. H. A. PERKINS.

CUTTER HEAD GRINDER.

APPLICATION FILED APR. 20. 1916.

l 1 93,295 Patentd Aug. 1, 1916.

2 SHEETS-SHEET 2.

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HIRAM A. PERKINS, OF ROCHESTER, NEW YORK, ASSIGNOR TO AMERICAN SPLINT 1 CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

CUTTER-HEAD GRINDER.

Specification of Letters Patent.

Patented Aug. 1, 1916.

Application filed April 20, 1916. Serial No. 92,437.

of this class the knives in order to work suclutely necessary to have each individual knife ground to the same bevel as the others,

and to have the knives project exactly the same distance from the cutter head sov that they shall all bear the same relation to the anvil over which the stock passes.

The object of my invention is to produce a simpleapparatus for securing this result, also to provide means by which the bevel of all the knives of the cutter head may be similarly changed if desired, and further to produce an apparatus which can be applied to the machine of which the cutter head forms a part without removing the cutter head or the knives. Further to produce a machine of this character which will do the work with accuracy and despatch.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a side elevation of the apparatus embodying my invention, the same being shown as applied to a cutter head, the latter appearing in diagram only, and Fig. 2 is a broken plan view of the apparatus shown in Fig. 1.

The cutter head 10 has tangential knives 11 and essentially radial shoulders 12-which afford backings for the knife supports. The knives project slightly from the face ofthe cutter head and operate as already stated. The machine of which the cutter head is a part has also parallel shafts 13 and 14 just above and adjacent to the center head. These serve as supports for the carriage 15 which can be moved back and forth opposite the cutter head sliding on the shafts 13 and 11. The carriage carries a motor 16 which by means of a belt 1'? drives the grinder 18 adapted to grind and sharpen the knives 11. I do not refer to the driving means of the grinder in detail because any suitable scheme can be used for driving the grinder, although a belt is preferable because it is more flexible and better adapted to permit of variations in the position of the grinder, as will presently appear.

The belt 17 is provided with a tightener having a pulley 19 which presses on one member of the belt, and. the pulley is sup ported on a tilting bracket 20 which is pivoted to the carriage as shown at 21, provided with a slot 22, and with a bolt 23 which projects through the slot and into the carriage so that the position of the tightener bracket 20 can be fixed. On one side the carriage has. a projecting arm 24 through which extends a vertically arranged gage screw 25 having preferably a milled head and a foot 26 which rides on the shaft 13. The position of the screw-fixes the height of the grinder with relation to the knives 11. Extending through the shaft 13 in a line oblique to the horizontal, is an index finger 27 which at its inner end is adapted to abut with the several shoulders 12 of the cutter head, and the position of the index finger is fixed by means of a set screw 28. A collar 29 is placed on the outer end portion of the finger and fastened by a Set screw 30, this collar being set up against the shaft 13 so that the operation of the grinder wheel 18 on one knife can be duplicated on the several knives, aswill presently appear.

It will be seen that when the grinder wheel is rotated in the direction of the arrow in Fig. 1, it will have a tendency to press the shoulder .12 against the index finger 27 and this will fix the bevel of the knife'll which is being ground. This bevel will be determined as is apparent by the length of the index finger from the shaft 13 to the shoulder 12. After one knife is ground the set screw 28 can be loosened and the index finger withdrawn or partly withdrawn, and then pushed back to-position with the collar 29 abutting with the shaft 13, and with the point of the finger against Y the next shoulder 12 of the cutter head, and obviously the bevel of the next knife will be exactly the same as that of the first.

It will be further understood that the grinder wheel 18 is constantly rotating, and that by pushing the carriage 15 along the shafts 13 and 14, the knives 11 will be accurately ground. It will be further understood that any suitable grinding wheel can be used, and that any preferred form of driving mechanism can be employed in connection with the grinder.

I claim 1. A grinder of the kind described comprising a'sliding and tilting carriage adapted to be positioned above the cutter head, a rotary grinding wheel on the carriage, a shaft adjacent one side of the carriage and parallel with the axis of the cutter head to the carriage and riding on the shaft, an index finger extending through the shaft to engage the work being operated on, and a grinding wheel on the carriage.

r 3. 'A grinder for rotary cutter heads comprising a pair of parallel shafts positioned above the cutter head to be ground, a carriage having a seat-on one shaft which permits it to slide and tilt on said shaft, a screw v the travel of the carriage, means riding on HIRAM A. PERKINS.

Witnesses:

WARREN B. HUTCHINSON, M. G. ODONNELL. 

